Background: I downloaded the building viewer from Github repo and got it working with some modifications.
I can now add my own building scene layer into it and use the "overview" and "surroundings" sections. But the "Floor by floor" section doesn't work as the floor picker on the right is not responsive, when clicking on different floors.

My understanding is that inside the config.txs, the FloorsSection code section controls which floor to show, using the floor varaible. This floor variable is then used to query feature layers with the same BldgLevel attribute in the building layer. This is approacch pretty similar to the building explorer inside the scene viewer. But I don't understand why my building layer is not working here in the building viewer.
Thanks in adavance to anyone who may have some thoughts on this.